The 24th Solar Activity Week Dark Bar Ejection Statistics Study

In this study,we used the solar flares and coronal mass ejection?CME?data obtained from SDO,SOHO / LASCO and so on and selected the strong flares event of all M-class and X-class during the period from 2005 to 2015.Then,the data recorded by JHelioviewer platform was used to judge the ejection of the filaments in each CME event.We classified these events into three categories: filaments totally ejected events,partially ejected events and not ejected events,and the total number of three categories of events was 214,among which occurred in 2014 is most,67,followed by 2013 and 2012,respectively,48 and 42,and 2011 the least,only 26 events occurred.Events occurred in the southern hemisphere of the sun was more than in the northern hemisphere,but the distribution of the eastern and western hemispheres is more uniform.In the following,we analyze the information about the distribution of the velocities,the angular widths,the masses and the kinetic energies of the CME of the three categories of events?the total ejection,the partial ejection and the non-ejection?,and obtain the following information: in the largest ranges of the speed,angle width,mass or kinetic energy of CMEs,the proportion of the total ejection events takes the largest percentage and the non-ejection smallest.It means as the solar activities more intense,the proportion of the total ejection is also rising.That is,the degree of the ejection is more intense,the more likely the event is to produce large-scale CME and flare.The averages of the CME parameters in the various events are: the average linear velocities are 737 km/s in the 46 total ejection events,595 km/s in the 70 partial ejection events,and 455 km/s in the 98 non-ejection events;the average angular widths are about 198°,174° and 135°in total ejection,partial and non-ejection events;the average masses are 8.78×10¹⁵ g,5.36×10¹⁵ g and 2.83×10¹⁵ g in total ejection,partial and non-ejection events;the average kinetic energies are about 7.25×10³¹ erg,4.14×10³¹ erg and 1.43×10³¹ erg.These results also showed the more intense the degree of the ejection,the larger parameters related statistical values of CME corresponding are.Expect to CME,we also counted the relationship between the degree of the ejection of the filament events and the related parameters of flares.According to the statistics,among small flares,close to 85% are related non-ejection filament events.In the medium intensity flares,the proportion of the total and partial ejection events are increased,and at the X-class,events accounted for significantly more than the other two types of events.Finally,we analyze the relationship between parameters of CMEs and flare intensity in three different events.In the CME event,the CME velocity and the flare were 0.54,0.25,and 0.34,respectively,indicating that only the full ejection of the CME velocity correlated with the intensity of the flare medium,the dark part of the ejection The CME and the dark spots of the non-ejection CME are closely related to the flare intensity.Because of the error in the projected speed and real speed of the CME event at the center of the day,we screen out events west of W60.The correlation between the velocity and the flare intensity of the partially ejected,partially ejected and non-ejected CMEs was 0.60,0.53 and 0.38,respectively.Obviously,for the same CME,W60 west CME speed and flare correlation significantly improved,but the non-ejection of the dark CME event is still associated with the intensity of the flare is very poor.For the west of the W60,the correlation between the CME event and the flare flow of the dark strip is all 0.70,0.80 and 0.55,respectively.Significantly more than the correlation with the flare intensity,and the correlation coefficient is more than 0.5.